Internal-combustion engine



F. STOKES.

INTERNAL COMBUSTION ENGINE.

APPLICATION FILED FEB. 10, I9IQ. l,34.7,9 1 9. P ent d uly 27, 1920.

2 SHEETSSHEET I.

F. STOKES.

INTERNAL COMBUSTION ENGINE.

APPLICATION man FEB 10. I;

Patented July 27, 1920.

4 SHEES SHEEI 2.

UNITED STATES MONT STOKES, OF CLABKSVILLE, ARKANSAS.

INTERNAL-COMBUSTION ENGINE.

' Specification 0! Letters Patent.

Patented July 2'7, 1920.

Application ma February 0, 1919. Serial No. 275,950.

To all whom it may. concern:

Be it known that I, FREMONT STOKES, a citizen of the United States, residing at Clarksville, in the county of Johnson and State of Arkansas, have invented certain new and useful Improvements in Internal- Combustion Engines, of which the following is a specification, reference being had to the accompanying drawings.

This invention relates to certain improvements in internal combustion engines, and has relation more particularly to an engine of this general character wherein rotary valves are employed for controlling the inlet and exhaust, and it is'a particular object of the invention to. provide novel and improved means whereby a charge or. mixture may be drawn into a cylinder during the entire suction stroke of the piston, and also whereby an exhaust of the gases is permitted throughout the entire scavenging stroke of the piston.

It is also an object of the invention to provide an engine of this general type wherein rotary valves are employed for controlling the intake and exhaust and wherein each of said valves. comprises novel and improved means for cooling the same so that said valves will not be subjected to expansion or contraction which would otherwise impair the eiliciency thereof.

Furthermore it is an object of the invention to provide an engine of this general type wherein each of the rotary valves is supported for rotation within a casing and wherein the port connecting the casing and the cylinder is substantially defined by a packing coacting with the valve to compeinsate for wear, so that the life of the motor will be prolonged.

The invention. consists in the details of construction and in the combination and arrangement of the several parts of my improved engine whereby certain important advantages are attained and the device rendered simpler, less expensive and otherwise more convenient and advantageous for. use, as will be hereinafter more fully set forth.

The novel features of my invention will hereinafter be definitely claimed.

In order that my invention may be the better understood, I will now proceed to describe the same with reference to the accompanying drawings, wherein:

Figure 1 is a view in horizontal section taken longitudinally through the valves as comprised in my improved motor;

Fig. 2 is a fragmentary sectional view taken substantially on the line 2-2 of Fig. 3 is a fragmentary sectional view iliaken substantially on the line 3-3 of ig. 4; is an enlarged fragmentary secders embodied in my improved structure,

and which cylinders are preferably four in number. The head 1 of each of the cylinders is provided at diametrically opposed points with the ports a and b, the port a constituting the intake and the port I) the exhaust, although it is to be understood if desired this may be reversed.

Each of the ports a and b is in commu nication with the portion 2 of a casing A integrally formed with all of the cylinders, and which casing is completed by the removable cap section 3. The cylinder C and the casings A are provided with the communicating water jackets 4. adapted for communication in a conventional manner with a suitable source of water supply and as is particularly illustrated in Fig. 3 it is to be noted that the jackets of adjacent cylinders are connected at their lower or inner ends so that the desired circulation may be effected. It is also to be particularly noted in Fig. 3 that an air space 5 is afforded between adjacent cylinders C in order to facilitate the cooling action.

Disposed axially througheach of the easings A is a tubular member comprising elongated sections S with adjacent sections coupled through the medium of the members M. The particular construction and operation of the members M is fully described and claimed in my Patent No. 1,307,160, dated June 17, 1919. It is to be noted, however, that the members M afford a connection between adjacent sections S whereby the same may be adjusted axially one relative to the other for a purpose which will hereinafter be more particularly referred to.

Formed with each of the sections S is a hollow cylindrical valve member V for coaction with either a port a or b and the periphery of said valve substantially contacts with the inwardly directed lips 6 carried by the casing A and defining such port and it is to be particularly noted that the opposed faces of said port in cross section are in parallelism so that in the event of,

wear upon the lips 6 the area of the port will not be affected. The valve V is of a major diameter less than the interior diameter of the casing A so that the valve V between the lips 6 is surrounded by a chamber 0.

Each of the casings A adjacent the valve V of a cylinder C has in communication therewith a pipe P, one of said pipes leading from a carbureter and the second pipe leading to an exhaust manifold or other desired point of discharge, and the combined measurements of the discharge end of a pipe P and a port a or b in a direction circumferentially of the coacting valve V must not be greater than one-fourth of the circumferential dimension of the valve.

Each of the valves V is provided in its surface with a depression or pocket 7 which affords a port or by-pass whereby flow may be had directly from a pipe P into or out of the cylinder C through a port a or b. As disclosed in Fig. 2, the piston D is about to start its suction stroke and in which instance the port a is about to open and the port I) is closed. As the piston D- travels on its suction stroke the charge or mixture will be drawn into the cylinder C through the port or by-pass 7 and port a until the port or by-pass 7 has entirely passed over the port a. As the port or by-pass 7 is of a length in excess of the major width of the port a it is to be understood that before said port or by-pass 7 has entirely passed over the port a the same will communicate with the chamber 0 above the port a so that a continued charge or mixture will be drawn into the cylinder through the chamber 0, the port or by-pass 7 and port a so that the drawing in of the charge or mixture within the cylinder C is assured throughout the entire suction stroke of the piston D.

During the scavenging or exhausting stroke of the piston D it will be obvious that the second valve V will coact with the port I) in substantially the same manner as has just been defined relative to the port a.

The lips 6 are provided with a channel 8 in which snugly fits a packing member 9 of suitable material, and which is constantly urged toward the adjacent valve V through the medium of the springs 10 of requisite mediate compartments B.

tension. By this means it will be at once self evident that leakage is avoided and compensation made for wear upon the lips 6. Each of the casings A is divided into a plurality of compartments B by the partitions 11 and the sections S are disposed through said partitions so that the partitions afford a medium whereby leakage is further prevented.

The valves are arranged within certain of the compartments B while the coupling members M and the bearings 12 for the tubular member are arranged within inter- I do not wish to be understood as limiting myself to any particular number of bearings 12, as this will depend upon the requirements of practice.

Each of the sections S is provided with the radiating ports 14 affording-communication between the bore of such section and the interior of the coacting valve V so that the water or other cooling medium flowing through the section S will enter within the valve V. It is also preferred that the ports 14 be substantially spirally arranged in order to facilitate the desired action of the water or other cooling medium. 1

The water or other cooling medium may be forced through the coupled sections S in any desired manner, but in practice I prefer to employ a separate cooling system including a force pump, and which pump (not shown) is preferred in view of the fact that the sections S- will be substantially horizontally disposed.

Adjacent end sections S of both of the casings A extend exteriorly of said casing and have aflixed thereto the sprocket wheels 16 over which is directed a chain 17 engaged with a wheel 18 fixed t0 the crank shaft 19 with the sprocket wheel 16 and the sprocket wheel 18 of such ratio to assure the requisite timed rotation of the valves V. It is also to be understood that the sections S are adjusted one relative to the other so that the ports or by-passes 7 are positioned in regular succession with either the ports a or b. It will also be self evident that by having the sections S separable one may be readily re placed when necessary independently of the remainder, and furthermore each of said sections is capable of independent adjustments in order to fully meet with the conditions and requirements of operation.

From the foregoing description, it is thought to be obvious that an engine constructed in accordance with my invention is particularly well adapted for use by reason of the convenience and facility with which it may be assembled and operated, and it will also be obvious that my invention is susceptible of some change and modification without departing from the principles and spirit thereof, and for this reason I do not wish to substantially cylindrical valve casing pro vided with a port in communication with the cylinder, said casing being provided with an inwardly directed lip defining the port, said casing being provided with a second port, a rotary valve mounted within the casing and substantially contacting with the inwardly directed lip, said valve being surrounded by a chamber in communicationwith the second port, said valve being provided -with a by-pass of a length in excess of'the space between the ports of the casing and of a len th in excess of the outside major circum erential extent of the lip.

2. An engine of the character described comprising, in combination, a cylinder, a substantially cylindrical valve casin provided with a port in communication with the cylinder, said casing being provided with an inwardly directed lip defining the port, said casing being provlded with a second port, a rotary valve mounted within the casing and substantially contacting with the inwardly directed lip, said valve being surrounded by a chamber in communication with the second port, said valve being pro vided with a by-pass of a length in excess of the space between the ports of the casing and of a length in excess of the outside major circumferential extent of the lip, and a packing carried by the lip and constantly urged toward the valve.

3. An engine of the class described comprising, in combination, a cylinder, a valve casing provided with two ports, one of said ports being in communication with the cylinder, a rotary valve mounted within the casing and provided with a by-pass, said valve, at points circumferentially between the bypass closing the port in communication with the cylinder, the major portion of the valve bein surrounded by a chamber in communlcation with the second port, said bypass being of a length in excess of the space between the ports of the casing and of a length in excess of the circumferential extent between the closed ends of the chamber.

In testimony whereof I hereunto afiix my signature in the presence of two witnesses.

FREMONT STOKES.

Witnesses:

ROBERT A. BOSWELL, W. E. LAWSON. 

